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Comparison of aerogrids and punched plates for smoothing flow from short annular diffusersScale model tests were conducted to evaluate the effectiveness of aerogrids and punched plates in producing flat velocity profiles downstream of short diffusers as would be used between the compressor and combustor of advanced aircraft engines. The diffuser had an area ratio of 4.17 and a length-to-inlet-height ratio of 2.07. The aerogrids tested were plates containing 1123 contoured venturis in parallel with geometric blockages of 83, 74, and 61 percent, respectively. The punched plates contained 1123 sharp-edged orifices with blockages of 58 and 30 percent. The results show that aerogrids, with higher effective blockage for the same pressure loss, are more effective flow-smoothing devices than the punched plates. Also, the overall pressure loss decreases and the exit velocity profile becomes flatter as either type of grid is moved closer to the diffuser exit plane.
Document ID
19720025343
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Rumpf, R. L.
(Johns Hopkins Univ. Laurel, MD, United States)
Shippen, W. B.
(Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
September 2, 2013
Publication Date
July 27, 1972
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-120960
Accession Number
72N32993
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-54545-B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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